This led to one of the funniest lines, when Chris had his Intervention to get him off drugs. They have to give a personal story to show how his addiction affected them, and Chris rolled-over during a nod-out and accidentally crushed Adriana's little dog.
Adriana: he killed my dog!
Paulie: what, was it barking?
The whole scene is well worth watching. It ends in a giant punch-up, as expected
Youtube search "Christopher Moltisanti, The Intervention", it's 4'45" long, and every second is comedy gold.